Automatic tire-pump.



Patented June 11, 1912.

FIG.

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ALBERT BREST, OF NEW CASTLE, PENNSYLVANIA.

AUTOMATIC TIRE-PUMP.

Application filed December 26, 1911.

T 0 all whom 'it may concern:

Be it known that I, ALBERT BnEsT, a citizen of the United States of America, residing at New Castle, in the county of Lawrence and State of Pennsylvania, have invented certain new and useful Improvements in Automatic Tire-Pumps, of which the following is a specification, reference being had therein to the accompanying drawing.

This invention relates to an automatic tire pump, and the primary object of my invention is to furnish the rim of a wheel with a pump for automatically inflating a pneumatic tire carried by the rim of a wheel, the pump being arranged and constructed whereby normal pressure of air will be maintained in the inner tube of the tire and the tire prevented from bursting due to an excessive pressure upon the same, provision being made for the escape of air from the inner tube of the tire when the tire' is unduly depressed.

A further object of this invention is to structed whereby greater supplies of air can be taken into the inner tube to maintain a normal temperature within the tube.

With the above and other objects in view, the invention resides in the novel construction, combination and arrangement of parts to be hereinafter specifically described and then claimed.

Reference will now be had to the draw ings wherein there is illustrated the pre ferred embodiment of the invention, but it is to be understood that the structural elements are susceptible to such changes as fall within the scope of the appended claim.

In the drawings like numerals denote corresponding parts throughout the views, in which- Figure 1 is a vertical sectional view of a. portion of a wheel and tire illustrating the pump in connection therewith, and Fig. 2 is a similar view of a modified form of pump.

The reference numeral 1 denotes a portion of the rim of a wheel supported by Specification of Letters Patent."

Patented June 11, 1912.

Serial No. 667,857.

spokes 2 and said rim has an opening 3 to accommodate the cylinder 4 of the pump. The outer end of the cylinder has a peripheral flange 5 that is secured to the rim 1 by-screws 6 or other fastening means.

The reference numeral 7 denotes the outer tube of a tire and arranged within the outer tube is an inner pneumatic tube 8. The tubes 7 and 8 are provided with openings 9 and 10 respectively and through which extends the outer end of a cylindrical casing 11 which is located within the cylinder 4. The said outer end ofthe casing 11 exteriorly screw threaded to receive a spacing nut 12 and a retaining nut 13, these nuts holding the outer end of the casing 11 in engagement with the tubes 7 and 8. The outer end of the casing 11 is in communi cation with the inner tube 8 and the inner end of the casing 11 is interiorly screwthreaded and provided with a collar 14, said collar being exteriorly screw-threaded. The collar 14 is screwed into the inner end of the cylinder 41-, the latter being exteriorly screw-threaded, as at 15, to receive the outer end of a cap 16, said cap having a handle 17 whereby it can be conveniently connected to the end of the cylinder 4. The cap 16 has a plurality of openings 18 in the side walls. thereof and these openings are screened or provided with woven wire covers 19, whereby when air is taken into the cap 16 foreign matter, as dust and dirt,

will be prevented from entering said cap. The cap 16 is provided with inwardly pro jecting lugs 20, said lugs engaging the end of the cylinder 4 and limiting the move-- ment of said cap upon the cylinder.

The reference numeral 21 denotes a horizontal partition within the casing 11, adjacent to the inner end of said casing, said partition having an opening forming a valve seat for a valve 22 that opens toward the inner end of the casing. The valve 22 is provided with a tubular stem 23 that extends into an opening 24 formed in a plug 25 that is screwed in the inner end of the casing 11. Encircling the tubular valve stem 23 is a coiled compression spring 26 said spring engaging the plug 25 and the valve 22 to retain the valve 22 normally seated in the partition 21 of the casing 11. The space between the partition 21 and the plug 25 serves as an auxiliary air reservoir to which air is admitted when the valve 22 is open.

valve stem 23 is interiorly screw-threaded,-

as at 32, whereby an air supply hose or tube can be connected to the stem 23 for forcing air into the casing 11, the valve 28 unseating due to the pressure of air within the stem 23. An ordinary hand-pump can be connected wit-h the stem 28 by removing the cap 16.

The reference numeral 83 denotes a tubu" 'lar piston rod extending intothe outer end of the casing 11 and into the inner tube 8, said piston rod having a conical-shaped head 34 covered by a shoe 35, preferably made of rubber or other yieldable material, whereby the end of said tubular piston rod cannot injure the inner tube 8. The tubular piston rod 33, adjacent the head 34 has screened openings 86, and the outer end of the iston rod is provided with a plurality of circumferentially arranged packing rings 37 engaging the walls of the casing 11, Arranged within the outer end of the tubular piston rod 33 is a spring-pressed valve 38, a. spring-seated valve 39, and a tubular valvestem 40, these elements being similar to the elements 22, 28 and 23 previously described in connection with the inner end of the casing 11.

It is thought that theconstruction and operation of the modified form of pump shown in Fig. 2 will be better understood after the operation of the pump as shown in Fig. 1 is described.

When the car is first placed in commission, the cap 16 is removed and an air supply hose connected to the ends of the tubular valve stem 23. Air is forced into the stem 23, unseating the valve28. The air passes into the stem 40 and unseats the valve 29, the air passing through the tubular piston rod 33 and escaping through the opening 36 into the inner tube 8 of the tire. Immediately upon the inner tube 8 being inflated and a supply of air shut oil, the valves 28 and 39 are seated by the retractilc springsencircling the rods of said valves. hen the tire is depressed, air within the tire is forced'into the tubular piston rod 33, unseating the valve 38 and the air enters the auxiliary. air reservoir t1 in the outer end of the tubular piston rod 38. A de pression of the tire also shifts the tubular piston rod by reason of the tire engaging the shoe As the piston rod moves in the casing 11, the valve 22 is unseated and the air within the casing 11 passes into the auxiliary air reservoir between the partition 21 and the plug lVhe'n the tire assumes its normal condition, the tubular piston rod 33 is restored to its normal posi tion by a coiled compression spring 42 located within the casing 11 between the partition 2i and the end of the tubular piston rod 33. Thi movement of the tubular piston rod causes the valve 28 to unseat and a quantity of air is drawn into the casing 11. Another depression of the tire and a 'movement of the tubular piston rod 33 within the casing 11, causes the valve 39 to unseat and admit air from the cas ng 11 into the tire,

providing, the casing H is filled with air and the valve 22 is prevented from unscating by the valve 39 opening in advance of the valve 22. This advance operation oi" the valve 39 with respect to the valve 22 is accomplished by reason of the valve 39 being of a less diametervthan the valve 22, and the spring associated with the valve 39 of less tension than the spring associated with the valve 22.

Reference will now be had to Fig. 2 of the drawings, wherein it will be observed that the cylinder l and the cap 16 are used similar to the cylinder 4 and the. cap 16 reviously described. Located within 'the cylinder P is a casing 43 having a by path 44. The by-path i is in communication with the inner tube 8 and the opposite end of the by-path has an air outlet valve 45. The valve 45 is of the spring-pressed type'that is normally closed, and said valve is opened to permit of an exhaust of air by an excessive depression upon the tire. The casing dhas a horizontal partition 46 provided with a valve seat for a valve 47. This valve is retained normally in a closed position by a single volute-helix spring 48 en circling the val'vdsteni 49 of said valve. Associated with the casing 43 is a hollow piston rod 50, similar to the piston rod 33 previously described, with the exception that the piston rod 50 has a partition 51 provided with a,single valve 52, said valve being similar to the valve 47 but upon a smaller scale.

The operation of the modified form of pump is very similar to the preferred form with the exception that the air within the inner tube 8 escapes through the medium of the by-path 44 when there is an excessive pressure of air within the tire.

From the foregoing it will be observed that I have devised a tire pump wherein a series of valves are employed for controlling the inlet and exhaust of air to and from a tire. It is through the medium of the tllbl'r lar or hollow piston rod of the pump that air is admitted to the tire for inflating, and while in the drawing there are illustrated the preferred embodiment of the invention, j

it is to be understood that the structural elements are susceptible to such variations and modifications as fall within the scope of the appended claim.

\Vhat I claim is:

In a tire pump, the combination with the rim of a Wheel, and a pneumatic tire carried thereby, of a cylinder secured to the rim of said Wheel, a cap detachably mounted upon the end of said cylinder, a casing located in said cylinder, a tubular piston rod arranged in said casing and extending into said tire and adapted to be actuated by a depression thereof, a pair of valves carried by said tubular piston rod at the inner end thereof for controlling the passage of air therethrough, and valves arranged Within said casing at the inner end thereof for controlling the inlet and exhaust of air to and from said casing.

In testimony whereof I affix my signature in the presence of two witnesses.

ALBERT BREST. Witnesses:

CHAS. B. MAYNE, HORACE GEARY. 

